Limitations of Map Reduce

Here are some cases where mapreduce does not work properly:

1. Iteration;when we need to process data again and again.
2. When we need a respond fast i.e; time consuming while processing the output.
3. It is not always easy to implement each and everything on MR program.
4. When we have OLTP needs, MR is not suitable for a large number of short on-line transaction.